20 CRUCIFERS. 
* Pods flattened parallel with the partition, the placental ribs forming the margin: radicle 
of the bent embryo lying against one edge of the cotyledons (accumbent ). 
Pods orbicular, nerveless: flowers small, white or yellowish. 
Pods large, fiat: seeds orbicular, flat, thin-margined: scapes 1-flowered..........e006 1 
Pods less than 2 lines broad: flowers in racemes: leaves spatulate, entire.........- es 12) 
Pods ovate or lanceolate to linear or oblong not an inch long........-. eed Stet esas 3 
Pods narrowly linear, valves nerveless, partition thickened. 
Pods long-beaked: stem leaves few, close together near the top...... ease sell eeeeecss, & 
Pods short-beaked: leaves scattered: racemes longer....... 0.2000: seeee cece ececeee 5 
Pods linear or narrower, an inch or more long, 1-nerved: seeds flat 
Anthers short: petals white, purple or rose-color: claw narrow, blade flat............ 6 
Anthers sagittate at base: petals usually unequal and crispate or twisted............ vA 
Sepals broad, not colored, the outer gibbous: petals broad, blade flat................ 8 
“ * Pods terete or scarcely flattened, often 4-angled: radicle lying against the side of the 
cotyledons or embracing them (incumbent ), or turned partly to one side (oblique ). 
+ Pods slender, 1 to 4 inches long; valves 1-nerved: seeds oblong, slightly flattened; cotyledons 
often oblique. 
Flowers white to purple: anthers sagittate. 
Petals undulately crisped, little exceeding the large sepals: claw broad.....-....--. 9 
Petals with flat limb much exceeding the narrow sepals..... ......- at Gousaemiesenee LO 
Flowers yellow, large: stem leaves narrow, mostly entire, 
Anthers linear, at length coiled: pods on long stipes, curved..... sedaesies asl wisleresoneiae - 11 
Anthers sagittate: stigma 2-lobed: pod 4-angled ; no stipe............e2eeees sacaesa’ LB 
+ + Pods linear, often less than an inch long: seeds in one row (except in Ist sp’s. of No. 15 
and in No. 16): at least the lower leaves pinnatifid. 
Seeds globose: cotyledons infolding the radicle: anthers sagittate......... ois isteare Slab’ 13 
Seeds oblong: anthers oblong: leaves lyrately pinnatifid, smooth............ eaieleees 14 
Seeds oblong, small: anthers sagittate: petals 1 to 3 lines long.......0....seee-e-+e LB 
Seeds in two rows: pods 4 to 6 lines long; valves nerveless....... Riera re esa ses, LS 
+ t + Pods oblong-ovoid to globose, beaked with the slender style. 
Densely stellate-pubescent: leaves mostly entire: flowers yellow.................-.. 17 
“ * * Pods flattened contrary to the narrow partition. 
Pods linear, 4, to 2k inches long, on slender axillary peduncles.......0..ceescese-s0- 18 
Pods ovoid, scarcely flattened, on slender scapes. Aquatic........ Mis sistee aces dae ele 
Pods linear, nearly terete: cotyledons 3-parted: petals included.......esccecscceees 20 
Pods angular-obcordate or oblong-obovate, many-seeded......00.ssceceosecccece.. 21 
Pods oblanceolate to obovate or cuneate-oblong, 4-8-seeded......scecsseecvcessos - 22 
Pods orbicular to obovate, 2-winged above, 2-seeded...... aoc vecerceccesccccscenes LE 
§ 2. Pods not splitting open when ripe: petals minute or wanting except in the last. 
Pods with 2 small globular seed-like cells, rough. -.......ssccccsscecescnsecsessss BS 
